Design and Evaluation of Gastro retentive Drug Delivery System of Anti Ulcer Drug | Patil | Journal of Food and Pharmaceutical Sciences 5386 14904 1 PB

J.Food Pharm.Sci. 2 (2015) 1-5

Research Article

Design and Evaluation of Gastro retentive Drug Delivery System of Anti
Ulcer Drug
J.S. Patil 1*, V.B.Biradar2, P.R. Biradar, S.S2. Shiralashetti2, S.C. Marapur2 P.B.Gurav1
1

Department of Pharmaceutics, SVERI s College of Pharmacy, Gopalpur-Ranjani Road, Gopalpur, Pandharpur-413 304,
Maharashtra, India.
2
Department of Pharmaceutics, BLDEA s College of Pharmacy, BLDE University, Bijapur-413 304, Maharashtra, India.
ARTICLE INFO
Received 10/06/2014
Received in revised form
08/08/2014
Accepted11/09/2014
Available online 01/10/2014

ABSTRACT

Floating matrix tablets of Lansoprezol were developed to prolong gastric
residence time, leading to sustained action of the drug. Tablets were
prepared by wet granulation technique, using hydroxypropylmethylcellulose as a polymer in two different grades, HPMC K4M and HPMC K15M.
Tablets were evaluated for their physical characteristics, viz., hardness,
thickness, friability, mass variation, drug content and floating properties.
Further, tablets were studied for in vitro drug release characteristics for 24
hours. The tablets exhibited controlled and prolonged drug release profiles
while floating over the dissolution medium. Non-Fickian diffusion was
confirmed as the drug release mechanism from these tablets, indicating that
water diffusion and polymer rearrangement played an essential role in drug
release. The best formulation (F4) was selected based on in vitro
characteristics and was used in vivo radiography studies by incorporating
barium sulphate. These studies revealed that the tablets remained in the
stomach for 12 hours in fasting rabbits and indicated that gastric retention
time was increased by the floating principle, which was considered
desirable for the absorption window drugs.
Keywords: Lansoprezol; floating
gastroretentive drug delivery system

1.

Introduction
In recent years, oral dosage forms for gastric
retention have drawn more and more attention for their
theoretical advantage in permitting control over the
time and site of drug release. This is particularly valuable
for drugs that exhibit an absorption window in the upper
part of the small intestine and dissolve better in the
acidic environment of the stomach (Zhenping et al.,
2001). Oral delivery of drugs is, by far, the most
preferable route of drug delivery due to the ease of
administration, patient compliance, and flexibility in
formulation. A controlled drug delivery system with
prolonged residence time in the stomach is of particular
interest for drugs that are locally active in the stomach,
*Corresponding author: pharmajspatil@gmail.com

tablets;

gastric

residence

time;

using current release technology, oral delivery for 24 h is
possible for many drugs; however, the substance must
be well absorbed throughout the whole gastrointestinal
tract. A significant obstacle may arise if there is a narrow
window for drug absorption in the gastrointestinal tract
(GIT), The real issue in the development of oral
controlled release dosage forms is not just to prolong
the delivery of the drugs for more than 12 h, but to
prolong the presence of the dosage forms in the
stomach or somewhere in the upper intestine until all of
the drug is released over the desired period of time
(Baumgartner et al, 2000). The principle of buoyant
preparation offers a residence time for the dosage form
and sustained drug release. The various buoyant

J.S. Patil, V.B.Biradar, P.R. Biradar, S.S. Shiralashetti, S.C. Marapur & P.B.Gurav J.Food Pharm.Sci (2015), 1-5

preparations include micro-balloons, granules, powders,
capsules, tablets, and laminated films (Sing and Kim,
2000). Based on the mechanism of buoyancy, two
distinctly different technologies, i.e., non-effervescent
and effervescent systems have been utilized in the
development of floating systems. Non-effervescent
systems commonly use gel-forming or highly swell-able
cellulose type hydrocolloids, polysaccharides and matrix
forming polymers such as polycarbonate, polyacrylate,
polymethacrylate, and polystyrene. Effervescent
systems utilize matrices prepared with swell-able
polymers such as methocel or chitosan and effervescent
compounds, such as sodium bicarbonate and citric or
tartaric acid (Rubinstein and Friend, 1994). The various
buoyant preparations include micro-balloons, granules,
powders, capsules, tablets, and laminated films. Based
on the mechanism of buoyancy, two distinctly different
technologies, i.e., non-effervescent and effervescent

systems have been utilized in the development of
floating systems. Non-effervescent systems commonly
use gel-forming or highly swellable cellulose type
hydrocolloids, polysaccharides and matrix forming
polymers such as polycarbonate, polyacrylate,
polymethacrylate, and polystyrene. Effervescent
systems utilize matrices prepared with swellable
polymers such as methocel or chitosan and effervescent
compounds, such as sodium bicarbonate and citric or
tartaric acid, or matrices containing chambers of liquid
that gasify at body temperature (Ritschel, 1991). Mahesh
et al. (2005) have developed the gastro-retentive drug
delivery system (GRDDS) for ofloxacin with different
polymers, such as psyllium husk, HPMC K100M,
crosspovidone and their combinations in order to get
the desired sustained release profile over a period of 24
h. Varshosaz et al. (2006) developed ciprofloxacin
floating and bioadhesive extended release tablets to
increase the duration of the drug presence in its
absorption area.Intragastric floating (IGF) drug delivery

systems can improve the controlled delivery of drugs
that have an absorption window by continuously
releasing the drug for a prolonged period of time before
drug reaches its absorption site, thus ensuring the
optimal bioavailability (Bansal, 2003). Lansoprazole is a
gastric acid pump inhibitor belonging to the class of
delayed release dosage forms known as proton pump
inhibitors PP)’s a dose regimen of PP)’s results in a
decrease in gastric acid secretion with a subsequent
elevation in gastric pH. The objective of the present
investigation is to prepare and to evaluate IGF tablets of
lansoprazole, which will help to retain the dosage form
in the stomach and to increase gastric residence time,
resulting in prolonged drug delivery in stomach using
gel-forming
polymers
such
as
hydroxypropylmethylcellulose (HPMC K4M, HPMC
K15M). A formulation that shows both combined

excellent buoyancy and sustained release characteristics
was chosen for farther in vivo evaluation by X-ray study
in rabbits for more than 10 h.

2

2.
2.1

Materials and mehods
Materials
Lansoprezol (ZPR) was a generous gift sample
obtained from Cipla pharmaceutical, Mumbai India.
HPMC K4M and HPMC K15M was a generous gift sample
received from Colorcon Asia Ltd, Goa India.
Microcrystalline cellulose was a gift sample received
from Ozone international, Mumbai India. All other
chemicals and reagents were of analytical grade and
purchased locally.
2.2 Methods of preparation of tablet:

The tablets were prepared according to the method
followed by Gambier (2007) and Kuksal (2006).
Lansoprazole, Polymer (HPMC K4M and HPMC K15M),
Sodium bicarbonate were passed through sieve No.40
separately. The drug was mixed with the Polymers and
other ingredients (table 1). Accurately weighed quantity
of PVPK-30 was dissolved in isopropyl alcohol (IPA) to
prepare a binder solution. The binder solution was
added to the dry blend gradually with constant kneading
to form a homogeneous mass. The dough mass was
passed through a 2.0-mm sieve and the granular mass
was allowed to dry at room temperature. The granules
were passed through a 1.18-mm sieve. These granules
were lubricated with magnesium stearate and talc and
compressed into tablet using 10.0mm flat face tooling on
a tablet compression machine (Remek mini press, India).
2.3 Evaluation of Tablet Characteristics:
2.3.1 Weight variation
Twenty tablets were selected random and weighed
individually. The average weight was calculated.

Individual weights of the tablets were compared with
the average weight.
2.3.2 Hardness
Tablet hardness has been defined as the force
required to breaking a tablet in a diametric compression.
Hardness values of the prepared formulations were
determined using Monsanto hardness tester (n=10).
The tablet was placed between two anvils of hardness
tester, force was applied to the anvils, and the crushing
strength that causes the tablet to break was recorded.
2.3.3 Friability
Tablets require certain amount of strength or
hardness and resistance to withstand mechanical shock
of handling in manufacturing, packaging, and shipping. A
pre-weighed sample (20 tablets) were placed in the
friabilator, and operated for 100 revolutions. Thereafter,
once again weight of the tablets is recorded. The
percentage friability was calculated based on the loss of
weight of tablet after keeping in the friabilator.
2.3.4 Thickness

Thickness of the prepared floating tablets was
measured using a calibrated dial caliper. Five tablets
were picked randomly and thickness was measured
individually.

J.S. Patil, V.B.Biradar, P.R. Biradar, S.S. Shiralashetti, S.C. Marapur & P.B.Gurav J.Food Pharm.Sci (2015), 1-5

2.3.5 Drug content uniformity
Twenty tablets were powdered and powder
equivalent to 30 mg of Lansoprazole was taken. The
powder was transferred to 100ml volumetric flask. 50ml
of 0.1 N HCl solutions was added, and stirred for 5 min.
The volume was made up to 100ml with 0.1N HCl solution
and filtered. The absorbance was measured at 276 nm,
against blank prepared in similar manner. The
experiments were conducted in triplicate. The drug
content was estimated by an UV spectrophotometer at
276 nm.
2.4 In vitro buoyancy studies
The time taken for the tablet to emerge on to the

surface of the medium is called as floating lag time.
Duration of the time by which the dosage form
constantly emerges on the surface of medium is called
as total floating time. Tablets were placed in a 100 ml
flask containing buffer solution of pH 1.2. The time
needed for a tablet go upward, float on the surface of
the liquid and floating duration was recorded.

3

the study. Before taking X-ray photographs, the
animals were held in upright posture. The animals were
exposed to X-ray photography in the abdominal region
at different time intervals (0, 4, 8, and 12 hours) for 12
hours. The tablet that remained buoyant on the surface
of the gastric content was observed visually from the Xray photographs.
3. Results and discussion
3.1 Characterization of tablets
The hardness of batches F1-F8 was found to be
between 4–5 kg cm2 indicating satisfactory mechanical
strength. The thickness of prepared batches was
between 2.2±0.3 and 2.7±0.6 mm. The friability was in
the range of 0.49–0.65 % for all the formulations, which
was an indication of good mechanical resistance of the
tablet. The average drug content of tablets (n = 10)
varied between 95.45 and 98.98%, indicating good drug
content for the prepared formulations. All the batches
exhibited uniformity of drug content and fulfilled the
compendial specifications of the various quality control
parameters.

2.5 In vitro dissolution studies
In- vitro drug release study was carried out using
USP XXIII, Paddle type dissolution apparatus in 900 ml of
pH1.2 solution, as a dissolution medium. The paddles are
rotated at 100 rpm. The Medium was set at 37 ± 0.5ºC. 1
ml of the sample was withdrawn at predetermined time
intervals (30 min) for the period of 3 hrs and thereafter
every hour for 24 hrs. The same volume of fresh medium
was replaced. The withdrawn samples were diluted with
10 ml of same medium in volumetric flasks and analyzed
by an UV spectrophotometer at 276 nm using 0.1 N HCl
as a blank. The experiments were conducted in triplicate.
The drug content and percent cumulative of drug
release were calculated using the equation generated
from standard calibration curve.
2.5 In vivo radiographic studies
The optimized formulation F4 was studied with
regard to buoyancy using radiography. To make the
tablet X-ray opaque, lansoprazole in formulation was
replaced with 30 mg of barium sulphate (BaSo4) and the
tablets were prepared as previously mentioned keeping
all other ingredients constant. The protocol of in-vivo
buoyancy studies on rabbits was carried out and
monitored by a radiographic method. The animal
experiment was approved by the Animal Ethical
Committee, BLDEA’s College of Pharmacy, Bijapur, )ndia
BLDEA’s COP/)AEC. Dated june 2009-Jan 2010). The
study was conducted on six albino rabbits of either sex
weighing between 2–2.5 kg (2.3 ±0.2 kg). The animals
were housed in individual cages and the experiments
were conducted in a sanitized room at a temperature
maintained at around 24 ºC. Food was withdrawn 12
hours prior to the study with water ad libitum. One
tablet to each animal was administered through specially
made oral gastric tube with 25 ml water in fasted state.
The animals were not allowed to eat or drink throughout

Fig1. In-vitro floating lag time study of F8

3.2 In vitro buoyancy studies
Lansoprezole tablets were prepared using
polymers such as HPMC K4M and HPMC K15M.
Formulations F1-F4 was prepared with HPMC K4M, and
F5-F8 was prepared with HPMC K15M. Tablets were
evaluated for physical characteristics such as hardness,
floating capacity and weight variation. The floating lag
time was found between 25±5 and 70±5. The formulation
F8 has shown very short floating lag time of 25±5 sec.
(Fig 1). The sodium bicarbonate was used as a gas
generating agent in order to float the tablet. The sodium
bicarbonate induces CO2 generation in the presence of
dissolution medium (0.1N HCl).The gas generated is
trapped and protected within the gel formed by
hydration of the polymer, thus decreasing of the density
of the tablet below 1gm/mL, and the tablet becomes
buoyant. The foating duration for the prepared batches
was in the range of 21.25±0.52 hrs and 24.95±0.34 hrs.
The formulaion F8 has shown prolonged floating lage

J.S. Patil, V.B.Biradar, P.R. Biradar, S.S. Shiralashetti, S.C. Marapur & P.B.Gurav J.Food Pharm.Sci (2015), 1-5

time of 24.95±0.34 hrs (Fig 2) when compared to all
other formulations followed by F4 which has shown
24.86±0.54 hrs. This indicated that the least amount of
HPMC K15 M and maximum amount of gas generating
agent used in F8 are responsible for good floating lag
time and maximum duration of floating. The floating lag
time and the duration of floating for the prepared
tablets are given in Table 2. In general, all the prepared
tablets floated between 21 to 24 hrs.

4

indicated as: HPMC K15M>HPMC K4M. The release of
the drug from the different formulations can be
arranged as:
F1